Back-spacing device for type-writers.



I WITNESSES G. A. SMITH. BACK SPAGING DEVICE FOR TYPE WRITERS.

APPLICATION FILED D E0.17,1906.

961 $46,, v Patented June 14,1910.

2 SHEETS-BHEET 1.

MI ZM G. A. SMITH. BACK SPAGING DEVIGE FOR TYPE WRITERS. APPLICATION FILED DBO. 1'], 1906.

Patented Jam 14, 1910.

2 SHEETS-SHBET'2.

WITNESSES v barren ermine earner omens.

GEORGE A. SIJIITH, OF NEW YORK, N, Y.. ASSIGNOR OF SIXTEEN ONE-HUNDRED-AND- FOURTI-IS T0 JAMES w.

HENNESSEY, OF RICHMOND. NEW YORK, FOR'TY-SIX ONE-HUNDBED-AND-FOURTHS TO ARTHUR LE'ITS, OF LOS ANGELES, CALIFORNIA, AND TWENTY-ONE ONE-HUNDRED-AND-FOURTHS TO FREDERICK H. WARD. OF

BROOKLYN, NEW YORK.

EACK-SPACING DEVICE FOR TYPE-WRITERS.

Specification of Letters Patent.

Patented June 11, 1910.

Application filed December 17, 1906. Serial No. 348,294.

To all whom it may concern:

Be it known that I, GEORGE A. SMITH, a citizen of the United States of America, and a resident of the city, county, and State of New York, have invented certain new and useful Improvements in Back-Spacing Devices for 'lype-lvriters, of which the following 1S1). specification. I

of a typewriter,-partly broken away to, more clearly illustrate the invention. Fig. 2 is a face view of a detail of Fig. 1. Fig. 3 is a vertical section illustrating those parts of the machine in which are embodied the present invention in front elevation.

In the improvements illustrated and which are now about to be described, certain mechanism is employed to release the carriage and have it checked at a certain point which will uniformly position certain numerals or letters of the lines beneath each other, and in accomplishing this end it is further necessary that means be provided to again set forward the carriage with its platen so many spaces as there may be digits or letters in the line. To accomplish this object I provide a keybar 5 of ordinary construction and mounted in the base of the machine in any desired manner, the mountin of this key lever not being shown but on y a fragment of the same is illustrated. To the lever 5 is pivoted a link 6 which is attached at its upper end to a lever 7 mounted on one of the cross-bars 8 of the machine or otherwise fulcrumed to the frame. The opposite end of this lever 7 is provided with a fiat-face 9 upon which plays the toe 10 of an arm 11 which is secured to the rack- .bar 12, loosely journaled in the standards 13 which standards also carry the way-rod 14: for the carriage; The carriage 15 is slidably mounted 011 this rod 14 and is provided the first numeral of the line stud 27 adapted to engage the s with an off-set 16, which normally is free to pass an adjustable stop 17 which is adapted to be placed at any point along the rack-bar 12 and whose'end 18 is held in the teeth of the rack-bar when locked.

By depressing the key-bar 5 the lever 7 by means of the link 6 is thrown upward at its rear end thus elevating the end of arm 11 and tipping the stop 17 backward, when it is thrown n the path of the projection 16. At the same time the rack-bar 19 of the carriage feed isreleased from the pinion 36 of the escapemcnt mechanism by means of the lever 20, shown in Figs. 2 and 3. and the propelling spring of the carriage then moves the same forward until it is arrested by the projection 16 coming in contact with the stop 17. The lever 20 may be operated ,by handor through suitable mechanism as maybe preferred. The carriage is now brought to a position which permits the printing of the last numerals of the predetermined column and it now becomes necessary to return the carriage with its platen to the position necessary for the printing of of figures, and this is accomplished by means of mechanism operated by the key-bar 21 which is also suitably pivoted in the frame of the machine and carries a pivoted link 22 having at its upper end an angular ofi-set 23, pivoted to an outer end of an arm 24: secured to a shaft 25 which is journaled in the frame of the machine. Thls shaft 25 also carries arm 26 having at its u per end the 0t 28, shown in Fig. 2, in one end of a bar 29 secured to one side of the opening in the top plate 30 of the machine by means of set screws 31, which pass through slots 32 in the bar 29 and permit the same to move longitudinally. At the end of the bar'29 opposite to the slot 28 is pivoted a pawl 35 by means of a pivot 34, the point of thepawl 35 to play in the teeth of the space-bar 19.-

Connected with thepawl-35 is an arm 33 provided at its free end with a cam 37 so positioned as to en age with the head of one of the screws 31 w en the slide bar 29 is in its position of rest. This engagement of 9 5 being adapted the cam with the head of the screweperates in position to engage with the rack 19. Whenever the key ever 21 is depressed and the bar 29 thereby moved the pawl and arm- 33 will be at the same time moved so as to carry the cam 37 away from the screw head 31 whereupon the pawl will immediately come into position to engage with the rack 19. This space or rack-bar, however, is only thrown into engagement with the pawl 35 when it is rocked on its pivots in the carriage so as to throw it out of engagement with the escapement pinion, the. release of the carriage being immediately after the rack-bar leaves. the pinion, but before it engages the pawl 35, the carriage then bemg in a position to receive the last letter of the group, of numerals to be tabulated. The key lever 21 is now depressed as many times as there are numerals in this group of figures, and the pawl 35 with each depression moves the carriage backward toward its starting point, when it is then left in the position to receive the first character of the group of letters or numerals.

It will beseen that the connections between the lever 7 and the arm 11 are not permanent, although they are so related 7 that the lever properly actuates the arm to accomplish its function, and the arm is f ree to be'lifted temporarily from its position on the face 9 of the lever and may readily return to-the said position without interfering with the operative connection. L1kewise the connection between the arm 26 and the slide 29 may be temporarily destroyed as when the top plate of the machine, is removed, but when it is'desired' to return the plate the stud 27 readily fits within the slot 28 and the parts are again connected for to remove the top plate of a ma-' united parts, but they are readily relieved of their cobperatin functions which are inplate is re stantly restored w en the to turned to its position on the rame.

Tt is obvious that certain modifications may be adopted in carrying out the ob'ects' of this invention without departin om the essential features as above descr' ed.

Having thus described my invention what I claim as new and desire to secure by Letters-Patent, is

In a typewriter, the combination with a relative to t e carriage and escapement mechanism cocperating with the rack bar,-

of back-spacing means comprising a pawl adapted to enga e withthe said rack bar when it is move to disengage the escapement mechanism, means for o from a position to beengaged. by the escapement mechanism to one where it may be engaged by the pawl, substantiallyas and for the purposes set forth. Signe at New York city this 13th day December 1906.

GEORGE A. SMITH.

Witnesses:

Jon H. HAzEL'mN, C. B. SoBnoEnEn.

erating the- 'pawl-and means for moving t e rack bar sliding carriagle having a rack bar movable 

